#absolute mammal

[not-kronyx]

[vickysaurus]

Whales! I know this is kicking in an open door but folks, they are really fucking big

[ravenzer]

Hozier heard about morning people and went

Respectfully,

✨️NO✨️

[atdawn]

Technically speaking, if he isn't... thirsty, hungry, in danger, or pain, then...broadly speaking, I suppose he is happy. What about you?

MAMMALS 1.06

[seaps]

oooooohh h.......... she said 'aisle'

[logarithmicpanda]

"Without feelings insignificant decisions become excruciating attempts to compare endless arrays of inconsequential things. It's just easier to handle those with emotions."

(Ancillary Justice, Ann Leckie)

I really like this take, it's so refreshing compared to people pretending logic is absolute and ideal

[bethanythebogwitch]

Wet Beast Wednesday: blue whale

It's the one-year anniversary of my Wet Beast Wednesday posts. My first post was on the smallest of all cetaceans, the vaquita. For the anniversary, I'm going to go to the other end of the spectrum and cover the largest of all cetaceans: the mighty blue whale. Join me as we explore the biggest of bois, the largest of lads, and the absolutest of units.

(Image: a blue whale at the surface of the ocean, seen from above. It is long, slender, and grey. The head is the widest point and takes up about a quarter of the body. The blowholes are positioned at the back of the head. Two flippers emerge from the body just behind the head. The tail fluke is very broad and pointed. End ID)

Blaenoptera musculus, the blue whale, is divided into four subspecies based on size and location. These are the northern blue whale (B. m. musculus), the north Indian ocean blue whale (B. m. indica), the antarctic blue whale (B. m. intermedia), and the pygmy blue whale (B. m. brevicauda). The northern and pygmy whales are further subdivided into population stocks based on what part of their range they live in. Blue whales are not only the largest cetaceans, they are the largest known animals to have ever existed. There are animals that can get longer, like the lion's mane jellyfish, but blue whales are the most massive animals. There are some extinct species that could potentially meet or exceed the blue whale in size, including some ichthyosaurs, whales, and sauropods, but all those species are known only from skeleton fragments so we can't get a fully accurate estimate of their size. Size varies depending on subspecies and population stock, but the longest group are the eastern north Pacific population, which can reach an average 24 m (79 ft). The antarctic subspecies is the heaviest, averaging 130 metric tons (290,000 lbs) for females. Females are larger than males. The pygmy subspecies is the smallest, though small is a relative term as they can still average 21.3 m (69.9 ft) and 99 metric tons (218,000 lbs). The longest scientifically measured individual was 30 m (98 ft), though there are unconfirmed reports of longer ones. The heaviest blue whale on record weighed 173 metric tons (381,400 lbs), though there are whales estimated to get up to 199 metric tons (438,720 lbs). Blue whales also have the largest hearts of any animal. One specimen measured in at 180 kg (400 lbs). The heart is about the size of a golf cart and 4 or 5 people could fit inside the chambers without having to squeeze. There's a commonly-quoted factoid that a person could swim through a blue whale's arteries without touching the sides. I wasn't able to find any exact measurements to confirm or refute this. I did find some sources saying that the blood vessels are highly elastic so its possible the factoids are talking about the arteries at their most stretched. Each heartbeat moves 220 liters of blood and the total blood volume is estimated at 5,300 liters. The heartbeat can be heard two miles away. I really just want to impress on you that these animals are fucking massive. A study on hydrodymanics suggested that a blue whale couldn't get longer than 33 meters (108 ft) before its metabolic and energy requirements would exceed the amount of food it could eat. Blue whales are verging on what is theoretically the maximum amount of big a whale can be.

(Image: an illustration comparing the size of a blue whale to other animals and showing their size. The whale is about as long as a line consisting of a polar bear, grizzly bear, human, asian elephant, giraffe, and great white shark. End ID. Source)

Blue whales are baleen whales, meaning that instead of teeth they have thick, keratinous plates called baleen attached to the upper jaw. When feeding, blue whales open their mouths and swim through clouds of krill. The mouth can open to 80 degrees and folds at the bottom let it expand to fit 220,000 liters of water at a time. The whale them closes its mouth and forces water out through the baleen. The baleen acts as a sieve, trapping krill in the mouth to be swallowed. Blue whales target patched of krill with the highest densities as their feeding style requires a minimum of 100 krill per cubic meter to offset the energy cost of feeding. Most mouthfuls provide 8,312 to 475,141 kilocalories of energy, more than enough to offset the cost of feeding. The current estimate for how much krill an adult needs in a day is 1,120 ± 359 kg (2,469 ± 791 lbs) and pregnant females need even more than that. Blue whales will dive in search of food, with the deepest confirmed depth being a pygmy blue whale that reached 506 m (1,660 ft). The deepest known dive from a non-pygmy blue whale was 315 m (1,033 ft). The longest recorded dive was 15.2 minutes and the estimated maximum dive duration is 31.2 minutes. During dives, a blue whale's heartbeat slows to 2 beats per minute, the slowest of any known animal. The elastic aorta seems to take over a lot of the heart's pumping job during this time. Blue whales are streamlined and similar in appearance to the relates sei whales and fin whales. Blue and fin whales are capable of hybridizing and producing fertile offspring. 3.5% of the blue whale genome comes from hybridization with fin whales. While blue whales can produce hybrid offspring with fin whales, the reverse is not true and the gene flow from fin to blue is unidirectional. It appears that all hybrids are the result of a fin father and a blue mother. Interestingly, blue whales do not appear to be capable of hybridizing with the more closely related sei whales. There are unconfirmed reports of blue whale and humpback whale hybrids. And because someone was going to bring it up if I didn't, the blue whale's penis is the largest of any animal at 3 m (9.8 ft) long and 30 cm (12 in) wide and they can release an estimated 17 liters of semen at a time. I know someone out there desperately wanted to know that and to that person I say you're whalecum.

(Image: a blue whale feeding at the surface of the ocean on its side, seen from above. The mouth is open with the troat and lower mouth inflated. It is swimming into a patch of krill, visible as yellowish coloration in the water. End id)

Blue whales can be found worldwide, though they typically prefer colder water and do not enter the Arctic ocean. They are usually solitary or travel in pairs, but can gather in groups up to 50 strong when food is abundant. Many are migratory, feeding in cold water during the summer and moving toward the equator in winter. They can follow complex migratory patterns that have to be memorized. There are multiple different strategies employed by different populations regarding who migrates when and some populations don't migrate at all. Their vocalizations are used for long-distance and short-range communication and scientists have classified multiple different types of sounds produced. Different populations of whales have different patterns of vocalizations which may be akin to languages or dialects. Blue whale sounds are some of the loudest and lowest frequency produced by any animal and most are too low-frequency to be audible to humans. Mating season happens in winter. Males use vocalizations to attract females, who they then court through special noises, blowing bubbles, inflating their mouths, chasing, and slapping the water with their flippers. Males compete with each other for the chance to mate. Once a female chooses a male, they will mate and then separate. Gestation takes 10 to 12 months. Newborn blue whales are the largest babies in the animal kingdom at 6-7 m (20-23 ft) and 2-3 metric tons (4409 to 6614 lbs). Mother produce between 110 and 320 kg (240 - 710 lbs) of milk daily. Claves are weaned between 6 and 8 months once they hit 16 m (53 ft) and have gained about 17,000 kg (37,500 lbs). Females typically mate every 2 to 3 years. Blue whale become sexually mature at 8-10 years old and can live over 90 years, with the oldest on record being 110 years old. Their age can be determined by earwax, which is laid down in rings like trees.

(Image: a mother blue whale (background) and calf (foreground). The baby is already very large and is a lighter grey than the mother. The baby is seen from the sied while the mother is rotates to show her underside. End ID)

All blue whale subspecies are classified as endangered by the IUCN, with the antarctic subspecies being critically endangered. Blue whales were heavily impacted during whaling, with their population dropping to the point of near-extinction. Since the end of whaling, populations have risen to an estimated 10,000 to 25,000 as of the end of 2023. This is still smaller than their pre-whaling population, but they have recovered quite a bit. The current largest threats to blue whales are climate change, collisions with ships, and human created noise. The effects of anthropogenic noise from shipping lanes on aquatic animals is still poorly understood, though it seems to greatly irritate and even harm whales, forcing them to change their migratory routes and avoid shipping lanes. Interestingly, as the population has increased scientists have noted changes in courtship behavior and vocalization tone. It is hypothesizes that the increasing population is resulting in greater competitive pressure between males for the right to mate.

(Image: a blue whale seen from the side. Its head is toward the camera. The lower jaw as larger and thicker than the upper jaw. The animal is streamlined. The eye is just behind the mouth and small. Further back is a paddle-shaped flipper. End ID)

[adhd-merlin]

Colin Morgan Thirst Poll

S5 Merlin

S1 Humans

S3 Humans

The Living and the Dead

The Fall

We Hunt Together

Benjamin

Belfast

Mammals

Testament of Youth

The Tempest

[grantaire-lover-69]

Enjolras brings out the part of me that wants to fuck older men like the animal I am. Of course it's not just him, Grantaire was basically my introduction to that feeling.

[critter-catcher]

One of our resident raccoons decided to clean his food before eating

[ovaruling]

god the human spine is such a shitshow. i’d much rather trade back my thumbs and self-recognition for a neutral horizontal spine and pelvis cuz this fucking upright mess is not worth it lmfao worst evolution ever award !

[carnivalcarriondiscarded]

im sorry im rewatching Dominion and its so fucking funny. they really brought dimetrodon & lystrosaurus' Permian Asses into it

[sheepcreature]

THE LAST TRACE OF STEELJAW IS HIM HOWLING HORRIBLY. WHAT THE FUCK

[rxttenfish]

honestly miranda's a lot more insecure than she will ever let anyone else know about or even mentally recognize and realize in herself - its just also in such specific and bizarre ways that no one ever picks up on it

[hiding-under-the-willow]

Tossing and turning in bed plagued by visions (Ed Edgar headcanons that are definitely just me projecting my cowboy ass autistic interest in strange animals onto him bc he too is a strange southern man with autistic swag)

[bethanythebogwitch]

I haven't covered any pinniped pals for Wet Beast Wednesday yet, so for my first one I'm going big. Really big. Elephant seal big. Elephant seals are not only the largest of all pinnipeds, they are the largest of all carnivorans and the largest marine mammals that aren't cetaceans. There are two species: northern (Mirounga angustirostris) and southern (Mirounga leonina), with the southern species being the larger of the two.

AAAAAAAAAAAAAHHHHHHHHH! (image: an elephant seal bellowing)

Elephant seals are true seals (as opposed to sea lions and walruses), meaning they lack external ears and their hind legs have fused into a sort of pseudo-flipper that allows for highly efficient swimming but is of little use when maneuvering on land. While it is common among pinnipeds for males to be larger than females, elephant seals exaggerated that with one of the most extreme size differences between sexes. Females of both species range from around 350 to 900 kg (880 to 1,980 lbs) and 2.5 to 3.6 m (8.2 to 11.8 ft) in length. Male northern seals average between 1,500 to 2,300 kg (3,300 to 5,100 lbs) and 4-5 m (13-16 ft) while southern males break the scale at 1,500 to 3,700 kg (3,300 to 8,200 lbs) and 4.2 to 5.8 m (14 - 19 ft). The southern species has the largest mass difference between sexes of any mammal, with the males averaging 5-6 times the weight of the females.

(image: male and female elephant seals chillaxing on a beach)

In addition to the size difference, the other major form of sexual dimorphism is that the male has his nose elongated into a proboscis. This snout serves two major functions: it amplifies the roars of the male allowing him to be remarkably loud and it traps and reabsorbs moisture when he exhales. This is important as the seals do not eat or drink when on land and recapturing moisture lets him stay hydrated.

(image: a male[top], female [bottom left] and juvenile [bottom right] northern elephant seal)

Seals are adapted to spend the vast majority of their lives in the water and elephant seals are no different. They spend around 80% of their lives in the water and have many adaptations to aid in their lifestyle. Like most marine mammals, they have a thick layer of fatty blubber that preserves heat in cold water, reduces drag, and provides buoyancy. Like other seals, they can slow their heartbeats and redirect blood flow to the core of their body to avoid losing heat. Another seal adaptation is that veins returning blood to the heart grow near arteries carrying blood from the heart. This allows the cold returning blood to leech some heat from the arteries to avoid cooling down the body's core. They have a lot of blood to store oxygen, allowing for long dives. Elephant seals dive deep (averaging 300-600 m but occasionally much deeper) when searching for food. Females typically go on deeper but shorter dives than males. They can hold their breath for over 100 minutes, longer than nay non-cetacean mammal.. Their eyes are highly adapted to low-light conditions and their whiskers can sense motion in the water, both things that aid in finding food. Elephant seals are very opportunistic predators and will eat a large variety of fish and cephalopods.

(image: a female elephant seal swimming)

The 20% of time not spent at sea is mostly taken up by two yearly periods: the molting and breeding seasons. In both cases, the seal will haul out onto the beach and will not eat or drink until it has finished. Molting season lasts about a month and usually occurs in summer. Elephant seals undergo what are called catastrophic molts, where they not only shed and regrow their fur but their outer layer of skin. During the regrowth of their skin, extra blood has to be directed toward it. In the water, this would cause too much heat loss, so it must be done on land. The skin sheds in large patches and not all at once, resulting in molting seals having a ragged appearance.

(image: a seal mid-molt)

The longer and more famous time on land is breeding season. In early spring, males will arrive on beaches and fight each other for dominance. In time, a few alpha males will claim most of the beach. These fights last even after the females arrive. Fights are very dramatic, involving posing and bellowing. If one male does not submit, they will fight by biting and slapping each other with their heads. Fights are rarely fatal, but are frequently bloody. Males have thicker skin on their chests to protect them during fights. Alpha males claim the right to mate with the females. Other males are forced to the outskirts of the beach, where they try to mate while the alpha is distracted. Some males will become betas, who help the alpha patrol his territory and drive off competing males. These betas will often try to mate while the alpha is distracted. Only the largest and strongest males can claim alpha status, and usually late in life when they have grown to their largest. After the females arrive, mothers will give birth to their pups. After birth, the female uses unique vocalizations so her pup can always recognize her. They nurse pups for up to 28 days while the males continue to fight. Elephant seal milk is extremely high in fat content, with up to 50% of the milk being fat, compared to 3.5% for cows. Some mothers may adopt the pups of others, especially if their own pup died before weaning. Weaning is very abrupt, after which the females will mate and the adults will return to the sea. The pups are left on land for up to 10 weeks, where they must learn how to swim and hunt while subsisting off the energy stores they built up while nursing. Juvenile mortality is high, with up to 50% of pups dying before reaching maturity. Adults can lose a third of their weight during breeding season.

(video: a clip from the BBC documentary Seven World One Planet about males fighting fro dominance. warning: there is blood)

(image: a mother seal and pup)

A few pups are known as super weaners because they can grow exceptionally large during nursing. This is usually due to the pup being adopted by an additional female and therefore getting an extra dose of milk or it will steal milk from another pup. In a few cases, the mothers will just wait longer before weaning for unknown reasons. Average pups weigh between 110 and 160 kg (250 - 350 lbs) at weaning while super weaners can weigh up to 270 kg (600 lbs). They can put on so much blubber their ability to move becomes impaired. Super weaners are rarely observed again after leaving the rookery. It has been speculated that their excess blubber makes them exceptionally buoyant, reducing their ability to dive and making it harder to feed, leading to increased mortality.

(image: a chonky baby super weaner)

Both species of elephant seal were hunted to near-extinction in the 19th century as their blubber could be used to make exceptionally high-quality oil. After the hunting period ended, their numbers increased to the point both species are classified as least concern by the IUCN, though their populations have never risen to pre-hunting numbers and many areas that were historically occupied are now vacant. Genetic bottlenecks in both species has led to an increase in diseases and birth defects. El Nino is known to have a negative effect on northern seals by drastically increasing pup mortality, so this year was probably a bad one. One major limiting factor in their population growth is a lack of beaches to haul out on and many beaches they use are now protected by local laws or as UNESCO World Heritage Sites.

(Gif: a female versus a car. Round 1, fight!)